I checked around for N. America and it looks like ISNA is going with:
Ramadan 1433 AH: The Astronomical New Moon is on July 19, 2011 (Thursday) at 4:24 Universal Time (7:24 a.m. Makkah time). Sunset at Makkah on July 19 is at 7:05 p.m., while moonset is at 7:11 p.m. Moon is born before sunset in Makkah and moonset is after sunset. Therefore first day of Ramadan is Friday, July 20, insha'Allah.
First Tarawih prayer will be on Thursday night.
and the sighting ppl are going with:
not sure yet? check http://hilalsighting.org/
in a few weeks i think!!